CN116390984A - Method for producing asphalt comprising rubber from discarded tires - Google Patents

Method for producing asphalt comprising rubber from discarded tires Download PDF

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Publication number
CN116390984A
CN116390984A CN202180075147.5A CN202180075147A CN116390984A CN 116390984 A CN116390984 A CN 116390984A CN 202180075147 A CN202180075147 A CN 202180075147A CN 116390984 A CN116390984 A CN 116390984A
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Prior art keywords
rubber particles
treatment step
heat treatment
subjected
powder
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CN202180075147.5A
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Inventor
L·莱利奥
M·洛萨
P·莱安德瑞
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Bridgestone Europe NV SA
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Bridgestone Europe NV SA
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L17/00—Compositions of reclaimed rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/18—Waste materials; Refuse organic
    • C04B18/20—Waste materials; Refuse organic from macromolecular compounds
    • C04B18/22—Rubber, e.g. ground waste tires
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/26—Bituminous materials, e.g. tar, pitch
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/22—Expanded, porous or hollow particles
    • C08K7/24—Expanded, porous or hollow particles inorganic
    • C08K7/26—Silicon- containing compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • C10B53/07—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of solid raw materials consisting of synthetic polymeric materials, e.g. tyres
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
    • C10C3/00—Working-up pitch, asphalt, bitumen
    • C10C3/002—Working-up pitch, asphalt, bitumen by thermal means
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
    • C10C3/00—Working-up pitch, asphalt, bitumen
    • C10C3/005—Working-up pitch, asphalt, bitumen by mixing several fractions (also coaltar fractions with petroleum fractions)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B2101/00—Type of solid waste
    • B09B2101/80—Rubber waste, e.g. scrap tyres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/20—Recycled plastic
    • C08L2207/24—Recycled plastic recycling of old tyres and caoutchouc and addition of caoutchouc particles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/141—Feedstock
    • Y02P20/143—Feedstock the feedstock being recycled material, e.g. plastics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Civil Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Road Paving Structures (AREA)

Abstract

A method for producing asphalt, comprising: a heat treatment step in which the rubber granules resulting from the granulation process of the scrap tyre are subjected to a temperature between 80 and 300 ℃ for a required time to obtain a density between 1.0 and 1.5g/cm 3 Rubber particles therebetween; and a mixing step in which the rubber particles from the heat treatment step are mixed with stone aggregate and asphalt to obtain asphalt.

Description

Method for producing asphalt comprising rubber from discarded tires
The present invention relates to a method of using rubber derived from discarded tires in the preparation of asphalt.
Herein and hereinafter, the term asphalt (asphalt) refers to asphalt conglomerate used to build a road surface.
Typically, road asphalt is composed of about 94% stone aggregate and about 6% asphalt (bitumen).
The use of rubber from scrap tires (PFU) or discarded tires has been known for some time (hereinafter, the english term ELT will be used, an acronym for discarded tires). In addition to exhibiting environmental advantages through the use of scrap, the use of ELT rubber provides advantages in terms of reducing rolling noise generated by dynamic tire-road contact.
The solutions implemented so far suggest two methods of use of rubber powders from ELT. One method (commonly referred to as the "dry" technique) suggests adding powder directly to the aggregate and bitumen during the mixing step of the bituminous conglomerate, wherein the amount of powder is in the range of 1-2% by weight relative to the mixture. Another method, commonly known as the "wet" technique, suggests mixing bitumen and powder and reacting them at a temperature that causes the rubber particles to expand, thereby obtaining what is referred to by the english term Crumb Rubber Modified Binder (CRMB); the amount of powder to be incorporated into the CRMB varies between about 15% and 22% with respect to the weight of the bitumen.
Considering that the powders used in accordance with these prior art techniques, the "dry" technique and the "wet" technique, only account for about 2% by weight of the asphalt, it is evident that the amount of ELT rubber that can be used for the asphalt is very low according to the solutions implemented so far. In addition to exhibiting an impediment to the important recycling of ELT rubber in asphalt, such limitations also preclude the possibility of investigating what possible performance advantage the asphalt obtained from the presence of more ELT rubber.
Thus, there is felt a need to be able to use ELT rubber in asphalt in amounts greater than those allowed by the above-described techniques in the prior art.
The inventors of the present invention developed a solution that makes it possible to meet the above-mentioned need by treating ELT rubber in a manner that enables it to be used as an inert material, as a partial replacement for stone aggregates, and thus overcoming the need to dissolve it in asphalt to produce CRMB.
The object of the present invention is a process for producing asphalt comprising: a heat treatment step in which the rubber particles resulting from the granulation process of the scrap tyre are subjected to a temperature of between 80 and 300 ℃, preferably between 100 and 200 ℃, for a desired time to obtain a density of between 1.0 and 1.5g/cm 3 Between, preferably between 1.2 and 1.3g/cm 3 Rubber particles therebetween; and a mixing step in which the rubber particles from the heat treatment step are mixed with stone aggregate and asphalt to obtain asphalt.
Preferably, the mixing step comprises: a first mixing operation in which stone aggregate and asphalt are mixed together at a temperature between 150 and 200 ℃; and a second mixing operation, wherein the rubber particles are added to the mixture from the first mixing operation.
Such a mixing sequence ensures a better particle distribution in the resulting asphalt.
Preferably, the rubber particles from the heat treatment step constitute 1 to 30% by volume of the amount of inert material contained in the asphalt.
Herein and hereinafter, the term inert material refers to a combination of stone aggregate and ELT rubber particles.
Preferably, the rubber particles resulting from the granulation process have a substantially polyhedral conformation, wherein the ratio of the largest dimension to the smallest dimension is less than 2.
Indeed, it was found that particles having three dimensions similar to each other gave better results.
Preferably, the rubber particles resulting from the granulation process have a size passing through a sieve having a sieve with a size between 10mm and 1.5mm, more preferably a sieve with a size between 2.0mm and 6.0 mm.
Preferably, the method comprises a pre-heating step prior to said heat treatment step, wherein the rubber particles resulting from the ELT granulation process are subjected to a temperature between 120 and 200 ℃ for a time between 15 and 30 hours.
Preferably, the method comprises a surface treatment step after said heat treatment step, wherein the rubber particles from the heat treatment are subjected to a surface abrasion operation.
By means of the abrasion operation, a powder is obtained which achieves a greater degree of compaction of the asphalt. Furthermore, the inventors consider extremely important that the powder should originate from the outer layer of the pre-treated rubber particles.
Preferably, the method comprises a final heat treatment step after said surface treatment step and before said mixing step; during said final heat treatment step, the rubber particles resulting from the surface treatment process are subjected to a temperature between 80 and 300 ℃, preferably between 100 and 200 ℃, for a desired time to obtain a density between 1.0 and 1.5g/cm 3 Between, preferably between 1.2 and 1.3g/cm 3 Rubber particles in between.
Another object of the invention relates to rubber granules and/or powders originating from a granulation process of discarded tyres, having a size passing through a sieve with a mesh size up to 10mm, and subjected to a temperature between 80 and 300 ℃ for a required time to obtain a density between 1.0 and 1.5g/cm 3 Between, preferably between 1.2 and 1.3g/cm 3 Rubber particles and/or powder in between.
Preferably, the particles and/or powder are subjected to a pre-heating step prior to the heat treatment step, wherein the rubber particles and/or powder resulting from the ELT granulation process are subjected to a temperature between 120 and 200 ℃ for a time between 15 and 30 hours.
Preferably, the particles and/or powder are subjected to a surface treatment step after the heat treatment step, wherein the rubber particles and/or powder from the heat treatment are subjected to a surface abrasion operation.
Preferably, the particles and/or powder are subjected to a final heat treatment step after the surface treatment step; during said final heat treatment step, the rubber particles and/or powders resulting from the surface treatment process are subjected to a temperature between 80 and 300 ℃, preferably between 100 and 200 ℃, for the required time to obtain a density between 1.0 and 1.5g/cm 3 Between, preferably between 1.2 and 1.3g/cm 3 Rubber particles and/or powder in between.
The maximum diameter of the rubber powder was 1.5mm.
The following are non-limiting embodiments that are shown purely by way of illustration.
Two bituminous conglomerate mixtures according to the present invention were produced.
The two conglomerates differ from each other according to the type of treatment to which the rubber particles derived from ELT are subjected. In particular, the first asphaltic conglomerate mixture is obtained using rubber particles that are subjected to only a heat treatment, while the second asphaltic conglomerate mixture is obtained using rubber particles that are subjected to both a heat treatment and a mechanical surface treatment.
In the following examples, the maximum diameter of basalt material was 8mm; the maximum diameter of the fine gravel material is 6mm; the maximum diameter of the basalt sand material is 4mm; the filler material and reinforcing fibers must meet the requirements shown in the tables below.
Requirements for filler
Figure BDA0004213751220000041
Reinforcing fiber requirements
Length (mum) 200÷6000
Diameter (μm) 8÷20
Tensile Strength (GPa) 1.5÷3.0
Maximum elongation (%) 1.0÷3.0
Melting point (. Degree. C.) >300
First bituminous conglomerate mixture
Particles with a size between 2.5 and 4.0mm are taken from rubber originating from the ELT granulation process.
The particles were subjected to a heat treatment step in a static laboratory oven at atmospheric pressure according to the following sequence:
-24 h at 175 ℃;
the materials were mixed periodically per hour at 250℃for a period of 10 hours.
Density of particles resulting from the above heat treatment>1.25g/cm 3 。
During the treatment at 250 ℃, both density and water absorption were checked regularly.
The rubber particles produced as described above are used for the preparation of a bituminous conglomerate mixture.
Table I shows the composition of the inert material of the first asphaltic conglomerate mixture in both% by volume and% by weight.
TABLE I
Basalt (basalt) Basalt sand Limestone filler Pretreated ELT particles
Volume percent 51.0 21.0 8.0 20.0
Weight percent 57.3 23.6 8.7 10.4
As will be described hereinafter, the asphaltic conglomerate mixture also includes bitumen in an amount equal to 8% by weight with respect to 100% by weight of inert material.
The process for preparing the asphaltic conglomerate mixture will be described below.
Basalt, basalt sand and asphalt were each heated separately from the other components until 165 ℃ was reached. Once the temperature of 165 ℃ is reached, the ingredients are placed in a mixer, which is then operated at a speed of about 80 rpm. After about one minute of mixing, reinforcing fibers were added. After about one minute of mixing, the filler was added. After about one minute of mixing, the pretreated ELT particles were added. After about one minute, the preparation was terminated.
The partial mixture was immediately used to determine the maximum density (according to UNI EN 12697-5).
To prepare the samples, the materials mixed at a temperature of 165℃were subjected to a thickening process by means of a rotary press (50 revolutions of the rotary press).
At the end of thickening, the sample is removed from the mold and allowed to cool to room temperature.
After 24 hours, the samples were cut according to specifications for subsequent mechanical testing (ITS, ITSR, CTI).
The parameters studied were:
ITS parameters for evaluating mechanical resistance (UNI EN 12697-23).
ITSR parameters (UNI EN 12697-12) for evaluating the sensitivity to water.
CTI parameters for evaluation of deformability index (UNI EN 12697-23).
Table II shows the results obtained for the above parameter values.
Table II
ITS(MPa) CTI(MPa) ITSR(％)
0.44 11.9 75
Table III shows the values of the volumetric properties as a function of the number of revolutions of the rotary press.
In particular, the volume characteristics studied are: void percentage (% Vv), volume percentage of asphalt (% Vb), volume percentage of aggregate (% Vag), void percentage in dry mix (% VMA), percentage of voids filled with asphalt (% VFA), true density of sample (Gmb), maximum density (Gmm), and degree of thickening (% Gmm).
Table III
Figure BDA0004213751220000061
Second asphalt conglomerate mixture
Particles with a size between 2.5 and 4.0mm are taken from rubber originating from the ELT granulation process.
The particles were subjected to a first heat treatment step in which the particles were subjected to a temperature of 150 ℃ in a static oven at atmospheric pressure for a period of 48 hours.
The particles from the first heat treatment step are then subjected to a surface treatment step to increase the specific surface area of the particles themselves. During the surface treatment step, the particles were passed five times through two horizontal axis rollers (P40 sandpaper) of a "Molino" machine.
The granules from the surface treatment step are then subjected to a final heat treatment step, in which they are subjected to a temperature of 150 ℃ in a static oven at atmospheric pressure, for a period of 120 hours, until a density of granules equal to 1.26g/cm is reached 3 。
During the final heat treatment step, both density and water absorption were checked periodically.
The rubber particles produced as described above are used for the preparation of a bituminous conglomerate mixture.
Table IV shows the composition of the inert material of the second asphaltic conglomerate mixture in both vol% and wt%.
Table IV
Basalt (basalt) Fine gravel Basalt sand Limestone filler Pretreated ELT particles
Volume percent 52.0 19.2 5.6 3.2 20.0
Weight percent 58.3 21.5 6.3 3.5 10.4
As will be described hereinafter, the asphaltic conglomerate mixture also includes bitumen in an amount equal to 5.5% by weight with respect to 100% by weight of inert material.
The process for preparing the asphaltic conglomerate mixture will be described below.
Basalt, pebble, basalt sand and asphalt were each heated separately from the other ingredients until 165 ℃. Once the temperature of 165 ℃ is reached, the ingredients are placed in a mixer, which is then operated at a speed of about 80 rpm. After about one minute of mixing, reinforcing fibers were added. After about one minute of mixing, the filler was added. After about one minute of mixing, the pretreated ELT particles were added. After about one minute, the preparation was terminated.
The mixture prepared as described above is treated to characterize it in terms of density and mechanical parameters.
The mixture treatment process, parameters and characterization processes are the same as those described above for the first asphaltic conglomerate mixture.
Table V shows the results obtained for the above parameter values.
Table V
ITS(MPa) CTI(MPa) ITSR(％)
0.33 10.8 88
Table VI shows the values of the above-mentioned volume characteristics as a function of the number of revolutions of the rotary press.
Table VI
Figure BDA0004213751220000071
From the data shown in tables II, III, V and VI, one skilled in the art will recognize that the asphalt resulting from the process, object of the present invention meets all the requirements needed for effective use.
The method, object of the present invention provides a significant advantage of allowing the use of large amounts of ELT rubber particles. This advantage results from modifying the ELT rubber particles so that they can be treated in the same manner as stone.
The method, object of the present invention also provides the advantage of avoiding high temperature dissolution operations of particles derived from ELT in bitumen, which has a significant benefit in terms of operator safety.
The results of the water sensitivity test on the conglomerate mixtures obtained according to the present invention demonstrate significant advantages with respect to the possibility of introducing a high percentage of particles derived from ELT into the asphalt conglomerate without using a high percentage of asphalt. If one considers that the prior art specifications so far regarding rubber powder mixtures provide a percentage of particles derived from ELT of only 2% by weight for using an asphalt content greater than or equal to 8%, the consequent improvement in the environmental sustainability of the road surface is evident, suggesting the reuse of particles derived from ELT.

Claims (16)

1. A method for producing asphalt, comprising: a heat treatment step in which the rubber granules resulting from the granulation process of the scrap tyre are subjected to a temperature between 80 and 300 ℃ for a required time to obtain a density between 1.0 and 1.5g/cm 3 Rubber particles therebetween; and a mixing step in which the rubber particles from the heat treatment step are mixed with stone aggregate and asphalt to obtain asphalt.
2. The method according to claim 1, characterized in that during the heat treatment step, the rubber particles resulting from the granulation process of the scrap tyre are subjected to a temperature comprised between 100 and 200 ℃ for a required time to obtain a density comprised between 1.2 and 1.3g/cm 3 Rubber particles in between.
3. The method according to claim 1 or 2, wherein the mixing step comprises: a first mixing operation in which the stone aggregate and the bitumen are mixed together at a temperature between 150 and 200 ℃; and a second mixing operation, wherein the rubber particles are added to the mixture from the first mixing operation.
4. The method according to one of the preceding claims, characterized in that the rubber particles from the heat treatment step constitute 1-30% by volume of the amount of inert material contained in the asphalt.
5. The method according to one of the preceding claims, characterized in that the rubber particles resulting from the granulation process have a substantially polyhedral conformation, wherein the ratio of the largest dimension to the smallest dimension is less than 2.
6. The method according to one of the preceding claims, characterized in that the rubber particles resulting from the granulation process have a size passing through a sieve having a mesh size between 10mm and 1.5mm.
7. The method according to one of the preceding claims, characterized in that the rubber particles resulting from the granulation process have a size passing through a sieve having a mesh size between 2.0mm and 6.0 mm.
8. Method according to one of the preceding claims, characterized in that it comprises a preheating step prior to the heat treatment step, wherein rubber particles resulting from the ELT granulation process are subjected to a temperature between 120 and 200 ℃ for a time between 15 and 30 h.
9. Method according to one of the preceding claims, characterized in that it comprises a surface treatment step following the heat treatment step, wherein the rubber particles from the heat treatment are subjected to a surface abrasion operation.
10. The method according to claim 9, characterized in that it comprises a final heat treatment step after the surface treatment step and before the mixing step; during said final heat treatment step, the rubber particles resulting from the surface treatment process are subjected to a temperature between 80 and 300 ℃ for a desired time to obtain a density between 1.0 and 1.5g/cm 3 Rubber particles in between.
11. The method according to claim 10, characterized in that during the final heat treatment step the rubber particles resulting from the surface treatment process are subjected to a temperature between 100 and 200 ℃ for a required time to obtain a density between 1.2 and 1.3g/cm 3 Rubber particles in between.
12. Asphalt, characterized in that it is manufactured using the method according to one of the preceding claims.
13. Rubber granules and/or powders from a granulation process of discarded tyres, having a size passing through a sieve with a screen having a size up to 10mm, and subjected to a temperature between 80 and 300 ℃ for a required time to obtain a density between 1.0 and 1.5g/cm 3 Rubber particles and/or powder in between.
14. Rubber particles and/or powder according to claim 13, characterized in that the rubber particles and/or powder are subjected to a preheating step prior to the heat treatment step, wherein the rubber particles and/or powder resulting from the ELT granulation process are subjected to a temperature between 120 and 200 ℃ for a time between 15 and 30 h.
15. Rubber particles and/or powder according to claim 13 or 14, characterized in that after the heat treatment step the rubber particles and/or powder are subjected to a surface treatment step, wherein the rubber particles and/or powder from the heat treatment are subjected to a surface abrasion operation.
16. Rubber particles and/or powder according to claim 15, characterized in that after the surface treatment step the rubber particles and/or powder are subjected to a final heat treatment step; during said final heat treatment step, the rubber particles and/or powders resulting from the surface treatment process are subjected to a temperature between 80 and 300 ℃ for a desired time to obtain a density between 1.0 and 1.5g/cm 3 Rubber particles and/or powder in between.
CN202180075147.5A 2020-11-06 2021-11-05 Method for producing asphalt comprising rubber from discarded tires Pending CN116390984A (en)

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Application Number Priority Date Filing Date Title
IT102020000026533 2020-11-06
IT202000026533 2020-11-06
PCT/EP2021/080745 WO2022096635A1 (en) 2020-11-06 2021-11-05 Method for manufacturing asphalt comprising rubber from end-of-life tyres

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EP (1) EP4240809A1 (en)
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WO (1) WO2022096635A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1300057B1 (en) * 1998-04-22 2000-04-05 Barbara Luciani COMPOSITION OF BITUMINOUS CONGLOMERATE FOR THE FORMING OF THE ROAD BASE LAYER AND PROCESS FOR ITS PRODUCTION
MX2020006750A (en) * 2018-01-04 2021-03-26 William B Coe Inter-penetrating elastomer network derived from ground tire rubber particles.
RU2701026C1 (en) * 2019-03-04 2019-09-24 Сергей Евгеньевич Шаховец Elastomeric oil bitumen modifier and elastomer-bitumen binder based thereon

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